Presidents Joe Biden and Vladimir Putin will speak in a video call on Tuesday, the White House and Kremlin said, as tensions between the United States and Russia escalate over a Russian troop build-up on the Ukrainian border that's seen as a sign of a potential invasion.Mr Biden will press US concerns about Russian military activities on the border and "reaffirm the United States' support for the sovereignty and territorial integrity of Ukraine," White House press secretary Jen Psaki said on Saturday, confirming the planned call after first word came from Moscow.READ MORE: Vladimir Putin to seek guarantees on Ukraine as invasion fears grow
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